Double ended marking instrument



FIG. 1 is a front elevational view of the double ended marking instrument showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is an exploded isometric view thereof, shown for clarity of illustration. 

The ornamental design for a double ended marking instrument, as shown and described. 